In the Mixtup calendar, each day of the week had a name, as follows: Sun, Moon, Hummingbird, Crow, Parrot, Jaguar, Eagle.

A 'season' was divided into 13 weeks, namely: Rabbit, Earth, Dog, Wood, Boar, Water, Ram, Wind, Horse, Metal, Bull, Fire, Serpent.

The Mixtups had the concept of a Great Year, which was around 5 of our years. This had 20 seasons, usually of 91 days, the names of which were the names of the 7 days, followed by the names of the 13 weeks, making 20 in all. Serpent seasons however had 14 weeks rather than 13, though otherwise following the normal progression of days and weeks; the 'leap week' was omitted every 8th Great Year which was not also a multiple of 80 such Years, such seasons being known as 'short Serpents'. A new Era started whenever the Day of the Sun in the Week of the Rabbit, in the Season of the Sun, coincided with New Year's Day. The years of an Era were more prosaically numbered 1,2,3,4,..etc.

An archaeologist asks you to examine a sculpture with the Mixtup inscription:

'Finished by Broltzlan on New Year's Day, Era 50, Year 47, Day of the Sun, Week of Fire, Season of the Earth.'

It certainly looks old, but is it genuine?